Shielded metal arc welding

About: Shielded metal arc welding is a research topic. Over the lifetime, 4462 publications have been published within this topic receiving 40560 citations. The topic is also known as: manual metal arc welding & flux shielded arc welding.

GTA pulsed current welding of thin sheets of SS304 producing superior quality of joint at high welding speed

Abstract: Thin sheets of austenitic stainless steel (SS304) are assembled using various pulse parameters of pulsed current gas tungsten arc welding The sheets are joined with high welding speed for higher production rate, but the mean current is enhanced with higher welding speed for maintaining required heat input to get a sound joint Application of pulsed current gas tungsten inert gas welding for joining of SS304 has been found advantageous in the form of production of weld joints with better mechanical and metallurgical characteristics It has been observed that there can be elimination or lesser humping in weld joints Undercut or dipped weld faces are also not found due to application of pulsed current There is improvement of tensile strength and hardness by 125 and 12%, respectively The enhanced tensile strength and hardness is justified through TEM micrograph showing presence of dislocation

Measurement of arc pressure and shield gas pressure effect on surface of molten pool in TIG welding

Abstract: Tungsten inert gas (TIG) welding is most frequently used for arc study because it is clean and easy to control welding factor. Many researchers have been focused on the plasma stream to find out the relationship between vertex angle and penetration of the tungsten electrode in TIG welding. Moreover, researchers studied the characteristics of vertex angle and arc pressure and heat flux distribution of the tungsten electrode. In addition, they have carried out factors that have influence on the behaviour of the molten pool. Previous studies assumed that arc pressure was dominant for the force that physically works on the surface of the molten pool, neglecting the shield gas pressure. In addition, they have been focused on the protection of molten weld pool from exposure to the atmosphere. The object of this study is to investigate the effect of shield gas pressure on the surface of the molten pool by measuring the distribution of arc pressure and shield gas pressure compared with arc physical result...

Optimization of vibratory welding process parameters using response surface methodology

Abstract: The current investigation was carried out to study the effect of vibratory welding technique on mechanical properties of 6 mm thick butt welded mild steel plates A new concept of vibratory welding technique has been designed and developed which is capable to transfer vibrations, having resonance frequency of 300 Hz, into the molten weld pool before it solidifies during the Shielded metal arc welding (SMAW) process The important process parameters of vibratory welding technique namely welding current, welding speed and frequency of the vibrations induced in molten weld pool were optimized using Taguchi’s analysis and Response surface methodology (RSM) The effect of process parameters on tensile strength and hardness were evaluated using optimization techniques Applying RSM, the effect of vibratory welding parameters on tensile strength and hardness were obtained through two separate regression equations Results showed that, the most influencing factor for the desired tensile strength and hardness is frequency at its resonance value, ie 300 Hz The micro-hardness and microstructures of the vibratory welded joints were studied in detail and compared with those of conventional SMAW joints Comparatively, uniform and fine grain structure has been found in vibratory welded joints